Amblyopia Essay examples - 1794 Words

Amblyopia This paper provides a brief description of amblyopia and discusses current research regarding the motion pathway in individuals with amblyopia. Amblyopia is a condition in which visual acuity in one eye is greatly reduced. It is caused by lack of stimulation or disuse during visual development (Rose, 1998). Because the eye is not fully developed at birth (Jarvis, 1992, as cited in Rose, 1998), infants need stimulation to complete the visual neural pathway. When one or both eyes are inhibited, for example due to misalignment of one eye (strabismus) or a large difference in refractive power between two eyes (anisometropia), the neural pathway for the inhibited eye develops abnormally, or does not develop at all. At†¦show more content†¦This information is important because it could provide meaningful insight into the nature of the underlying problems involved (Hess Anderson, 1993). There is a general consensus that amblyopes have reduced contrast sensitivity, grating acuity, and spatial resolution in one eye and a loss of binocular vision (Levi, 1991; Sireteanu et al., 1977, as cited in Fahle Bachmann, 1996). Amblyopes also suffer from crowding (Levi Klein, 1985, as cited in Fahle Bachmann, 1996) which causes difficulty, for example, in comprehending a letter found in text rather than an isolated letter. The mechanisms delegating positional information are also disabled in amblyopes (Rentschler Hilz, 1985, as cited in Fahle Bachmann, 1996). Even though amblyopia results in a profusion of visual obstacles, there is one area for which amblyopia may actually provide beneficial. Arguments have been made that while fine spatial detail has been affected in amblyopes, the motion pathway has not been affected (Chung Levi, 1997; Kubova, Kuba, Juran, Blakemore, 1996), and may even be more acute (Fahle Bachmann, 1996). It has been proposed that in amblyopes the parvocellular pathway is impaired resulting in loss of fine spatial detail (Kubova, et al., 1996). On the other hand, parasol cells that lie in the magnocellular layersShow MoreRelatedThe, The Silent Thief, By. Levi, Knill And Bavelier1590 Words   |  7 PagesDraft essay Amblyopia is described by; Levi, Knill and Bavelier (2015) as a neurodevelopmental disorder of the visual cortex. A disorder characterised by Rose (1998) as the â€Å"silent thief†, a term that purportedly portrays the consequences of amblyopia going undetected. Amblyopia has been reported as the most common cause of monocular blindness worldwide Wong (2012), and in a recent review conducted by (Tailor, Bossi, Greenwood and Dahlmann-Noor, 2016) was cited the most common visual deficit amongRead More Strabismus Essays1347 Words   |  6 Pagesdifferent directions. One eye may look straight ahead, whil e the other eye turns inward, outward, upward, or downward. You may always notice the misalignment, or it may come and go. A second disorder, amblyopia, commonly goes along with strabismus. Again, from the American Academy of Ophthalmology, Amblyopia is p oor vision in an eye that did not develop normal sight during early childhood. It is sometimes called lazy eye. (7) The reason these two conditions are so closely linked relates to how the brainRead MoreAnalysis Of Hubel And Wiesel s Silent Thief 1624 Words   |  7 Pagesclinical interest stems from efforts to find better treatments for amblyopia (‘lazy eye’), a common developmental disorder of vision affecting 2–4% of the population.Amblyopia is described by; Levi, Knill and Bavelier (2015) as a neurodevelopmental disorder of the visual cortex. A disorder characterised by Rose (1998) as the â€Å"silent thief†, a term that purportedly portrays the consequences of amblyopia going undetected. Amblyopia has been reported as the most common cause of monocular blindness worldwideRead MoreEssay On Vivisection727 Words   |  3 Pagesthat without the use of animals in the laboratory, humans would not have modern medicine like antibiotics, analgesic, and cancer drugs (1). For example, Hanlon believes by sewing kittens’ eyelids together can aid researchers to study the effects of amblyopia in children (1). Conversely, the use of animals as laboratory test subjects can give rise to inaccurate results because of the biological and genetic differences between human and nonhuman species. This essay argues against Hanlon’s stance on vivisectionRead MoreMyopia ( Nearsightedness ) Is A Common Vision Condition1234 Words   |  5 Pagesproperly, leading to amblyopia(weaken vision) in the eye. Strabismus can be caused by problems with eye muscles, the nerves that transmit information to the muscles, or the control center in the brain that directs eye movement. It can also develop due to other general health condition or eye injuries. Amblyopia also known as lazy eye is reduced vision in one eye caused by abnormal visual development early in life. The weaker- or lazy - eye often wanders inward or outward. Amblyopia generally developsRead MoreSeeing With The Eyes Or The Brain1873 Words   |  8 Pagescontrol the amount of light that enters your eye. Amblyopia In amblyopia, the muscles around the eyes are too weak to hold the eye in place correctly. This means that the eyes become misaligned and leads to a loss in visual acuity. Amblyopia usually starts to develop at an early age such as during childhood and, on many occasions, only affects one eye. However, if left untreated, it can cause severe visual disability in the eye. One way of treating amblyopia is through the use of the patching method. WithRead MoreEssay About Children1498 Words   |  6 Pagescouldn’t see him at all when the doctor himself stood in front of me. The doctor walked me back to the room my parents were still perched on the chairs in and closed the doors. â€Å"Folks, your daughter has amblyopia.† * * * I took a deep breath and leaned over the desk to settle myself. â€Å"Amblyopia is a condition where the nerves in my brain can’t receive the images my eye is trying to send to it.† I had given this explanation to people a million times, and it always takes me back to that day I wasRead MoreVideo Games And Its Effects On The World1988 Words   |  8 Pagesdone by Charlie Ngo, a professor at the University of California, have actually shown that playing both action and non-action video games can help prevent amblyopia, or â€Å"lazy eye† (Charlie pg. 1). The visual pressure and engagement that action video games provide to the player help improves his, or her, vision and, therefore, patients with amblyopia (the medical term used when the vision in one of the eyes is reduced because the eye and the brain are not working together properly) can improve theirRead MoreThe Effects Of Video Games On Our Children1627 Words   |  7 Pagesimproves our basic visual processes. In brief, it improves visual contrast sensitivity and provides successful treatment of amblyopia. For instance, â€Å"Fifty hours of action video game play (spread over ten to twelve weeks) improved visual contrast sensitivity (the ability to distinguish subtle differences in shades of gray) compared to controls† (Burnsed 23). Furthermore, Amblyopia (also called â€Å"lazy eye†) is a disorder arising from early childhood in which one eye becomes essentially non-functional.Read MoreViolent Video Games Have Negative Effects904 Words   |  4 Pagestherapeutic [stress reliever], and it improves motor skills and eye coordination. â€Å"A study conducted by researchers at McMaster University indicates that playing first person shooter games can help improve the eyesight of people with conditions like amblyopia or cataracts.† (Carter). Others say â€Å"Video game violence gives me a non-violent source of aggression release...† (Keeney). In spite of this compelling argument, research conducted has shown that a child is highly influenced by the things he or